Описание
In the Linux kernel, the following vulnerability has been resolved:
x86/xen: fix xen_hypercall_hvm() to not clobber %rbx
xen_hypercall_hvm(), which is used when running as a Xen PVH guest at most only once during early boot, is clobbering %rbx. Depending on whether the caller relies on %rbx to be preserved across the call or not, this clobbering might result in an early crash of the system.
This can be avoided by using an already saved register instead of %rbx.
In the Linux kernel, the following vulnerability has been resolved:
x86/xen: fix xen_hypercall_hvm() to not clobber %rbx
xen_hypercall_hvm(), which is used when running as a Xen PVH guest at most only once during early boot, is clobbering %rbx. Depending on whether the caller relies on %rbx to be preserved across the call or not, this clobbering might result in an early crash of the system.
This can be avoided by using an already saved register instead of %rbx.
Ссылки
- https://nvd.nist.gov/vuln/detail/CVE-2025-21818
- https://git.kernel.org/stable/c/23f6f420cd727d641f95478fcf3bbbee41e4e5d6
- https://git.kernel.org/stable/c/242f7584da3ad041a9db809d33d27a8be8eccc29
- https://git.kernel.org/stable/c/4890a0858c09d96f3234a8f94663de80a7201bc4
- https://git.kernel.org/stable/c/522d726824cc570e0b6bf0b3af4d5a826f1b17c5
- https://git.kernel.org/stable/c/98a5cfd2320966f40fe049a9855f8787f0126825
CVE ID
Связанные уязвимости
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
[REJECTED CVE] In the Linux kernel, the following vulnerability has been resolved: x86/xen: fix xen_hypercall_hvm() to not clobber %rbx xen_hypercall_hvm(), which is used when running as a Xen PVH guest at most only once during early boot, is clobbering %rbx. Depending on whether the caller relies on %rbx to be preserved across the call or not, this clobbering might result in an early crash of the system.
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.